Question

If 10 men, working 7 hours a day dig a trench 147 m long, how many men working 8 hours a day will dig a trench 168 m long (of the same breadth and depth as the first in the same number of days)? ​

Answer 1

Answer:

Working 7 hours a day 147 m long trench can be dig by = 10 men

Working 1 hour a day 147m long trench can be dig by = 10∗7

working 1 hour a day 1 m long trench can be dig by = 10∗7/147

working 8 hours a day 1 m long trench be dig by = 10×7/147×8

working 8 hours a day 160 m long trench can be dig by =

147×8

10×7×160

=9.523

So, 10 members are required